The nuclear BAG-1 isoform, BAG-1L, enhances oestrogen-dependent transcription.

Abstract:

:BAG-1 is a multifunctional protein that interacts with a wide range of cellular targets including heat-shock proteins and some nuclear hormone receptors. BAG-1 exists as three major isoforms, BAG-1L, BAG-1M and BAG-1S. BAG-1L contains a nuclear localization signal, which is not present in the other isoforms, and is predominantly localized in the cell nucleus. Here we have investigated the effects of BAG-1 on function of the oestrogen receptor (ER), a key growth control molecule and target for hormonal therapy in breast cancer. We demonstrate that BAG-1L, but not BAG-1S or BAG-1M, increased oestrogen-dependent transcription in breast cancer cells. BAG-1L interacted with and stimulated the activity of both ER alpha and beta. Although BAG-1L and ERs colocalize to the nucleus, fusing BAG-1S to an heterologous nuclear localization sequence was not sufficient to stimulate transcription. Consistent with an important effect on receptor function, nuclear BAG-1 expression in breast cancers was associated with expression of the progesterone receptor, a transcriptional target of ERalpha, and was associated with improved survival in patients treated with hormonal therapy. These data suggest that BAG-1L is an important determinant of ER function in vitro and in human breast cancer.

journal_name

Oncogene

journal_title

Oncogene

authors

Cutress RI,Townsend PA,Sharp A,Maison A,Wood L,Lee R,Brimmell M,Mullee MA,Johnson PW,Royle GT,Bateman AC,Packham G

doi

10.1038/sj.onc.1206688

subject

Has Abstract

pub_date

2003-08-07 00:00:00

pages

4973-82

issue

32

eissn

0950-9232

issn

1476-5594

pii

1206688

journal_volume

22

pub_type

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